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CN101146137A - Key assembly and mobile terminal having the same - Google Patents

Key assembly and mobile terminal having the same Download PDF

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Publication number
CN101146137A
CN101146137A CNA200710085067XA CN200710085067A CN101146137A CN 101146137 A CN101146137 A CN 101146137A CN A200710085067X A CNA200710085067X A CN A200710085067XA CN 200710085067 A CN200710085067 A CN 200710085067A CN 101146137 A CN101146137 A CN 101146137A
Authority
CN
China
Prior art keywords
light pipe
key buttons
light
optical transmitting
transmitting set
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA200710085067XA
Other languages
Chinese (zh)
Other versions
CN101146137B (en
Inventor
洪常基
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of CN101146137A publication Critical patent/CN101146137A/en
Application granted granted Critical
Publication of CN101146137B publication Critical patent/CN101146137B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/83Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/02Constructional features of telephone sets
    • H04M1/22Illumination; Arrangements for improving the visibility of characters on dials
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00Legends
    • H01H2219/036Light emitting elements
    • H01H2219/044Edge lighting of layer
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00Legends
    • H01H2219/054Optical elements
    • H01H2219/06Reflector
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00Legends
    • H01H2219/054Optical elements
    • H01H2219/062Light conductor

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Push-Button Switches (AREA)
  • Telephone Set Structure (AREA)

Abstract

A key assembly and a mobile terminal having the same. The key assembly includes a plurality of key buttons, a light guiding sheet arranged below at least one of the plurality of key buttons, a light emitter to generate light into an edge of the light guiding sheet, the light guiding sheet directing light from the light emitter towards at least one of the plurality of key buttons, a circuitry supporting substrate formed below the light guiding sheet; and a plurality of switches formed on the circuitry supporting substrate, each of the plurality of switches corresponding to one of the plurality of key buttons. The light guiding sheet overlays an upper portion of each of the plurality of switches.

Description

Button assembly and portable terminal with it
Technical field
The present invention relates to be used for the button assembly of portable terminal, and the portable terminal with it.
Background technology
Portable terminal is to allow user radio ground transmission/reception data, perhaps a lot of portable electric appts of process information a kind of when mobile.Because for the user is carried easily, it is lighter and more elongated that portable terminal becomes, and this portable terminal need be in the mechanical structure of the various functions of realization in very little and the limited equipment.
Usually, provide button assembly to this portable terminal, this button assembly has a plurality of key buttons with by user's input digit, character and other control command.Fig. 1 is the cutaway view that illustrates according to the button assembly of prior art.As shown, the button assembly 1 of the prior art comprises and is exposed to portable terminal outside, and is a plurality of key buttons 2 that can operate with pushing.Switch 6 be positioned in key button 2 below, and be installed on the upper surface of circuit board 4 received signal when key button 2 is pressed.Pad 3 is attached on the lower surface of key button 2, and flexibly is out of shape when key button 2 is pressed, thereby so that to switch 6 pressurization input signals.When pressing, key button 2 is used for the pressurization projection 7 of switch 6 pressurizations is positioned in pad 3.
Key button 2 is positioned on the shell 9, so that expose outside, and has symbol on the upper surface of key button 2, such as, numeral, character or other CMD.This symbol is used as recessed type printing, with the light (it will be explained after a while) by producing from light-emitting diode (LED) 5 selectively, thereby realizes the backlight of this symbol.
When the user promoted key button 2, the pressurization projection 7 of pad 3 applied pressure to switch 6.Therefore, the user can import the key of wanting.
The a plurality of LED5 that are used to illuminate key button 2 are up outstanding near the switch 6 of circuit board 4.Symbol on key button 2 is illuminated by LED5, makes user even in the dark can import this symbol.
But in existing button assembly technology, because the distance between LED5 and key button 2, light is not equally distributed.In addition, in order to strengthen the brightness of key button 2, must increase the number of LED5, thereby need bigger power consumption.
In order to solve above-described problem, Korean Patent Publication No. No.10-2003-89182 discloses a kind of being used in the technology with arrangement optical plate on the mainboard of dome switch, and this optical plate has and the corresponding through hole of dome switch.
But in Korean Patent Publication No. No.10-2003-89182, the number of through hole is corresponding to the number of dome switch, thus processing operation that need be difficult.In addition, a large amount of light disappear in the optical plate, thereby can not illuminate each key button fully.
Korean Patent Publication No. No.10-2005-64351 discloses a kind of technology, and optical plate is attached on the lower surface of keypad, and light emitting devices is installed in and is attached to adhering on the circuit board on the optical plate.But,, need be used for fixing the extra structure of light emitting devices and electrical connecting unit owing to individually light emitting devices and mainboard are installed.Therefore, the entire process complexity, and production cost increases.
Summary of the invention
According to principle of the present invention, provide by button assembly is used light guide member and can reduce the button assembly of number of light sources and amount of power consumption, and the portable terminal with it.
In order to realize the advantage of these and other, and according to purpose of the present invention, as implementing herein and describing widely, a kind of button assembly is provided, it has a plurality of key buttons, is placed in the light pipe below at least one of a plurality of key buttons, produces the optical transmitting set that enters light pipe edge light, the direction of this light pipe direct light at least one towards a plurality of key buttons from optical transmitting set is formed on the circuit supporting substrate below the light pipe; And being formed on the on-chip a plurality of switches of circuit supporting, each of a plurality of switches is corresponding to one of a plurality of key buttons.This light pipe covers each top of a plurality of switches.
In another aspect, light pipe be positioned in all a plurality of key buttons below, and the light pipe direct light from optical transmitting set the direction towards all a plurality of key buttons.
In another aspect, this button assembly comprises the reflector layer on the periphery that is positioned at light pipe, be used for from the light-redirecting of optical transmitting set away from periphery.
In aspect another, optical transmitting set can be installed on the upper surface of circuit supporting substrate.
More on the one hand in, each of a plurality of switches is formed has cheese, and light pipe forms by flexible material, it prevents that the switch that is close to is pressed when the switch corresponding to one of key button be pressed.
In another aspect, light pipe, perhaps is attached on the surface, its underpart along its edge by two-sided tape attached on the circuit supporting substrate by adhesive.
In another aspect, be used for a plurality of reflection graphic patterns that the light concentrated area from optical transmitting set is directed to each key button partly are formed on lower surface with the corresponding light pipe of a plurality of key buttons.
More on the one hand in, a plurality of key buttons are used as an integral body pad and form, and this pad comprises: form outward appearance and have opaque layer with the numeral that will import or the corresponding symbol that is penetratingly formed of character, this opaque layer is defined for each upper surface of a plurality of key buttons.This is paid somebody's debt and expected repayment later on the lower surface that is included in opaque layer and with the integrally formed hyaline layer of opaque layer be formed on a plurality of pressurization projections on the lower surface of hyaline layer.Each pressurization projection is corresponding to one and of a plurality of switches of a plurality of key buttons.Opaque layer can be formed by metallic plate, and hyaline layer can be to form to silicon or silicon rubber on the metallic plate by being total to injection-molded.
According to another aspect of the present invention, a kind of portable terminal is provided, it combines the feature of one or more above-described button assemblies.
From the detailed description that provides hereinafter, the application's the further scope of application will become more apparent.But, should be understood that, though expression the preferred embodiments of the present invention, detailed explanation and specific example only provide by the example explanation, because from this describes in detail, for those these those skilled in the art, various within the spirit and scope of the present invention variations and modification will become apparent.
Description of drawings
This accompanying drawing of following is included to provide further to be understood the present invention, and is incorporated into and constitutes the part of this specification, and it illustrates embodiments of the invention, and can work to explain the principle of the invention with this specification.In the accompanying drawings:
Fig. 1 illustrates the cutaway view that is used for according to the button assembly of the portable terminal of prior art;
Fig. 2 is the perspective view that illustrates according to the portable terminal of the embodiment of a demonstration of the present invention;
Fig. 3 is the cutaway view that the line III-III along Fig. 2 is got; And Fig. 3 A is the partial enlarged drawing of a part of the cutaway view of Fig. 3; With
Fig. 4 is the perspective view of decomposition of the button assembly of Fig. 2.
Embodiment
To at length be introduced the preferred embodiments of the present invention now, the accompanying drawing illustrated that its example is being followed.Hereinafter, will explain in more detail according to button assembly of the present invention and portable terminal with it.
Fig. 2 is the perspective view that illustrates according to the portable terminal of the embodiment of a demonstration of the present invention.As shown in Figure 2, provide button assembly terminal body mounted thereto 11 to portable terminal 10.
The display 12 that is used for display video information is set at the front of terminal body 11, and button assembly 20 is set on the side of display 12.The receiver or the loud speaker 13 that are used to export voice signal can be installed in the upper end of terminal body 11, and the microphone 14 that is used for input speech signal can be installed in the lower end of terminal body 11.
Fig. 3 is the cutaway view that the line III-III along Fig. 2 is got, and Fig. 4 is the perspective view of decomposition of the button assembly of Fig. 2.Shown in Fig. 3 and 4, a plurality of key buttons 31 are arranged to be exposed to the outside of portable terminal 10, and can be used as a complete pad 30 and form.
Especially, see in Fig. 4 equally that this pad (pad) 30 comprises the opaque layer 32 that forms key button 31 outward appearances and have the symbol 31a that penetratingly forms thereon.This symbol is corresponding to the numeral that will import or character.Hyaline layer 33 is integrally formed on the lower surface of opaque layer 32, and a plurality of pressurization projection 34 is formed on the lower surface of hyaline layer 33, its each corresponding to of key button 31.This pressurization projection 34 is used for switch 51 pressurizations, and this will explain after a while.
This opaque layer 32 can be to be formed by the metallic plate with fabulous hardness and intensity, and this hyaline layer 33 can be to form to silicon or silicon rubber on the metallic plate by being total to injection-molded.Alternatively, this opaque layer 32 can be formed by transparent plastic, and the symbol of the numeral imported when key button 31 is pressed when of expression or character can be reserved as on upper surface, lower surface or the middle body that recessed type backlight is printed on each key button 31.
In order to prevent that when a key button 31 is pressed contiguous key button 31 is pressed, and for identification key button 31 easily, this opaque layer 32 is formed in the opaque layer 32 with cutting profile 32a.This hyaline layer 33 by molded, filled in notch portion 31a, thereby prevent that external material is introduced among the notch portion 31a.In addition, when light produced from the bottom of this pad, the line of demarcation that is used for separate key button 31 was observable.
The circuit supporting substrate is set at such as printed circuit board (PCB) 50 on the bottom of this pad 30, and the switch 51 with dome corresponding with each key button 31 is positioned on its upper surface.Preferably, circuit supporting substrate or plate thin, flexibility can be used as this plate 50, thereby reduce the whole thickness of this portable terminal.
The light pipe 40 that the light that is used for producing from the optical transmitting set 52 that is installed on the plate 50 be directed to each key button 31 is set at upper surface and a plurality of switch 51 of plate 50.Shown in Fig. 3 and 4, this light pipe 40 is integrally formed, so that while overlay 50 and switch 51.In addition, this optical transmitting set 52 is close to the side surface of light pipe 40, makes the light that produces from a lip-deep optical transmitting set 52 that is placed in plate 50 can incide on the side surface of light pipe 40.Can provide flat surface 53 so that each of a plurality of switches linked together, and flat surface 53 can be made by reflectorized material, perhaps have the reflector layer that forms thereon.
By optical transmitting set 52 is installed, can simplify the manufacture process of this button assembly 20 on plate 50.As optical transmitting set 52, preferably use the light source that forms the LED of the high brightness that contrasts such as the power that has and expend.In addition, because light pipe 40 shield light not, the light that produces from an optical transmitting set 52 can be transmitted to all key buttons.Therefore, can reduce the number and the power of light source.
Preferably, this light pipe 40 is formed by the flexible material that can easily be out of shape, so that prevent to push contiguous key button 31 when a specific key button 31 is pressed.When key button 31 was pressed, the projection of pressurizeing accordingly 34 was pushed light pipe 40, and these light pipe 40 push switches 51.Therefore, this light pipe 40 is along with this switch 51 moves.When the pressing force that puts on key button 31 was removed, this light pipe 40 returned to the home position by the elastic force of switch 51.
This light pipe 40 is formed the light that makes from its side surface incident and can moves towards its positive direction via reflection.In addition, this light pipe 40 provides and is used for the concentrated area direct light to each reflection graphic patterns part 41 of key button 31.Each of this reflection graphic patterns part has the zone corresponding to each switch 51.This reflection graphic patterns part 41 is that the cut of formation precision or concave point are realized on the lower surface of light pipe 40 by etching, laser treatment or other suitable processing.
This light pipe 40 is by adhesive, perhaps by being attached to the lip-deep two-sided tape 42 in its underpart along its edge attached on this plate, thereby is convenient to assembling.
In addition, reflector layer 44 can also be set on the circumference of light pipe 40, will redirecting away from this circumference from the light of optical transmitting set 52, and towards the direction of a plurality of key buttons 31.As shown in Figure 4, this reflector layer 44 can be formed on adhesive layer 42 tops substantially.
This light pipe 40 can be by multi-carbonate with approximate 0.125mm thickness or polyamino Ethyl formate, and perhaps other suitable materials form, thereby make this portable terminal elongated.
Hereinafter, with the operation of explaining according to this button assembling of the present invention.With reference to figure 3, make the light that produces from optical transmitting set 52 incide on this light pipe 40.Then, this light moves in light pipe 40 via total reflection.When light when the direction of each key button 31 moves, the character of key button 31 or digital 31a are illuminated.
With reference to figure 4, this light pipe 40 is attached directly on this plate 50, thereby does not need extra assembling process betwixt.Since this light pipe 40 form make to cover this plate 50 and switch 51 both, the light that produces from optical transmitting set 52 does not cover light pipe 40.Therefore, the number of this optical transmitting set 52 can be reduced, and power consumption can be lowered.
As the aforementioned, at button assembly and having in its portable terminal, this light pipe that the light that is used for producing from the optical transmitting set of installing onboard be directed to the key button is positioned in a upper surface of switch.Therefore, the light that produces from optical transmitting set 52 does not cover light pipe 40.Therefore, the number of this optical transmitting set 52 can be reduced, and power consumption can be lowered.Though only show an optical transmitting set 52, should be understood that to provide more than one optical transmitting set, and the power consumption that still will be used to illuminate key button 31 reduces to minimum.
In addition, because this optical transmitting set is mounted onboard, does not need to be used to install the extra parts of optical transmitting set, and simplified the whole erection process.
In the embodiment of demonstration, provide portable terminal with incorporate terminal body.But button assembly of the present invention also goes for having the folding type or the sliding type portable terminal of at least two main bodys.
Because the present invention can not break away from its spirit or basic characteristic is implemented with some forms, unless otherwise mentioned, should be appreciated that in addition, above-described embodiment is not subjected to the restriction of previously described any details, but should be interpreted as widely in its spirit and scope that appended claim limits, therefore, all variations and modification drop in the generally acknowledged scope of claim, and therefore the equivalence of perhaps so generally acknowledged scope is intended to be comprised by appended claim.

Claims (18)

1. button assembly comprises:
A plurality of key buttons;
Be placed in the light pipe below at least one of a plurality of key buttons;
Generation enters the optical transmitting set of the light at light pipe edge, the direction of this light pipe direct light at least one towards a plurality of key buttons from optical transmitting set;
Be formed on the circuit supporting substrate below the light pipe; With
Be formed on the on-chip a plurality of switches of circuit supporting, each of these a plurality of switches is corresponding to one of a plurality of key buttons;
Wherein this light pipe covers each top of a plurality of switches.
2. according to the button assembly of claim 1, wherein, this light pipe be positioned in all a plurality of key buttons below, and this light pipe direct light from optical transmitting set the direction towards all a plurality of key buttons.
3. according to the button assembly of claim 2, further comprise:
Be positioned at the reflector layer on the periphery of light pipe, it is used for the light from optical transmitting set is redirected away from periphery.
4. according to the button assembly of claim 3, wherein this optical transmitting set is installed on the upper surface of circuit supporting substrate.
5. according to the button assembly of claim 3, wherein, each of these a plurality of switches is formed has cheese, and this light pipe is that material by flexibility forms, and it prevents that switch contiguous when one switch corresponding to the key button be pressed is pressed.
6. according to the button assembly of claim 3, wherein this light pipe is by adhesive or by being attached to the lip-deep two-sided tape in its underpart along its edge attached on the circuit supporting substrate.
7. according to the button assembly of claim 3, wherein, be used for a plurality of reflection graphic patterns that the light concentrated area from optical transmitting set is directed to each key button partly are formed on surface with the corresponding light pipe of a plurality of key buttons.
8. according to the button assembly of claim 1, wherein, these a plurality of key buttons are used as whole pad and form, and this pad comprises:
Form outward appearance and have and the opaque layer of the symbol that the numeral that will import or character are penetratingly formed accordingly, this opaque layer is defined for each upper surface of a plurality of key buttons;
On the lower surface of opaque layer and with the integrally formed hyaline layer of opaque layer; With
Be formed on a plurality of pressurization projections on the lower surface of hyaline layer, each pressurization projection is corresponding to one and of a plurality of switches of a plurality of key buttons.
9. button assembly according to Claim 8, wherein, this opaque layer is formed by metallic plate, and this hyaline layer is to be formed to silicon or silicon rubber on the metallic plate by injection-molded altogether.
10. portable terminal comprises:
Main body; With
Be installed in the button assembly on the main body, this button assembly comprises:
A plurality of key buttons;
Be placed in the light pipe below at least one of a plurality of key buttons; With
Generation enters the optical transmitting set of light at the edge of light pipe, the direction of this light pipe direct light at least one towards a plurality of key buttons from optical transmitting set;
Be formed on the circuit supporting substrate below the light pipe; With
Be formed on the on-chip a plurality of switches of circuit supporting, each of these a plurality of switches is corresponding to one of a plurality of key buttons;
Wherein this light pipe covers each top of a plurality of switches.
11. according to the portable terminal of claim 10, wherein, this light pipe be positioned in all a plurality of key buttons below, and this light pipe direct light from optical transmitting set the direction towards all a plurality of key buttons.
12. the portable terminal according to claim 11 further comprises:
Be positioned at the reflector layer on the periphery of light pipe, it is used for the light from optical transmitting set is redirected away from periphery.
13. according to the portable terminal of claim 12, wherein this optical transmitting set is installed on the upper surface of circuit supporting substrate.
14. portable terminal according to claim 12, wherein each of these a plurality of switches is formed and has cheese, and this light pipe is that the material by flexibility forms, and it prevents that when one switch corresponding to the key button be pressed, contiguous switch was pressed.
15. according to the portable terminal of claim 12, wherein, this light pipe is by adhesive or by being attached to the lip-deep two-sided tape in its underpart along its edge attached on the circuit supporting substrate.
16., wherein, be used for a plurality of reflection graphic patterns that the light concentrated area from optical transmitting set is directed to each key button partly are formed on surface with the corresponding light pipe of a plurality of key buttons according to the portable terminal of claim 12.
17. according to the portable terminal of claim 12, wherein, these a plurality of key buttons are used as whole pad and form, and this pad comprises:
Form outward appearance and have and the opaque layer of the symbol that the numeral that will import or character are penetratingly formed accordingly, this opaque layer limits each upper surface of a plurality of key buttons;
On the lower surface of opaque layer and with the integrally formed hyaline layer of opaque layer; With
Be formed on a plurality of pressurization projections on the lower surface of hyaline layer, each pressurization projection is corresponding to one and of a plurality of switches of a plurality of key buttons.
18. according to the button assembly of claim 17, wherein, this opaque layer is formed by metallic plate, and hyaline layer is to form to silicon or silicon rubber on the metallic plate by being total to injection-molded.
CN200710085067XA 2006-09-12 2007-02-28 Key assembly and mobile terminal with same Expired - Fee Related CN101146137B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020060088268 2006-09-12
KR10-2006-0088268 2006-09-12
KR1020060088268A KR101228452B1 (en) 2006-09-12 2006-09-12 Keypad assembly and mobile terminal having it

Publications (2)

Publication Number Publication Date
CN101146137A true CN101146137A (en) 2008-03-19
CN101146137B CN101146137B (en) 2012-04-18

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US (1) US7488910B2 (en)
EP (1) EP1901321B1 (en)
JP (1) JP5301118B2 (en)
KR (1) KR101228452B1 (en)
CN (1) CN101146137B (en)
BR (1) BRPI0700266A (en)
DE (1) DE102007003271B4 (en)
ES (1) ES2430289T3 (en)
MX (1) MX2007002082A (en)
RU (1) RU2341032C1 (en)

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US7488910B2 (en) 2009-02-10
MX2007002082A (en) 2008-11-18

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